<s>
Blake	B-Application
Stone	I-Application
:	I-Application
Planet	I-Application
Strike	I-Application
is	O
a	O
first-person	O
shooter	O
video	O
game	O
,	O
the	O
sequel	O
to	O
Blake	B-Application
Stone	I-Application
:	I-Application
Aliens	I-Application
of	I-Application
Gold	I-Application
,	O
made	O
by	O
JAM	O
Productions	O
and	O
released	O
for	O
DOS	B-Device
on	O
October	O
28	O
,	O
1994	O
,	O
by	O
Apogee	O
Software	O
.	O
</s>
<s>
Following	O
Pyrus	O
Goldfire	O
's	O
escape	O
at	O
the	O
end	O
of	O
Aliens	B-Application
of	I-Application
Gold	I-Application
,	O
British	O
Intelligence	O
initiated	O
a	O
large-scale	O
search	O
to	O
capture	O
him	O
.	O
</s>
<s>
Blake	B-Application
Stone	I-Application
is	O
once	O
again	O
sent	O
to	O
stop	O
the	O
villain	O
,	O
with	O
a	O
direct	O
order	O
to	O
find	O
and	O
terminate	O
Dr.	O
Goldfire	O
,	O
so	O
that	O
he	O
would	O
never	O
threaten	O
Earth	O
again	O
.	O
</s>
<s>
In	O
contrast	O
to	O
Aliens	B-Application
of	I-Application
Gold	I-Application
,	O
in	O
which	O
the	O
player	O
has	O
to	O
retrieve	O
the	O
red	O
access	O
card	O
to	O
unlock	O
the	O
next	O
floor	O
in	O
the	O
elevator	O
,	O
the	O
player	O
advances	O
levels	O
in	O
Planet	O
Strike	O
by	O
way	O
of	O
the	O
"	O
Security	O
Cube	O
"	O
.	O
</s>
<s>
The	O
game	O
contains	O
one	O
linear	O
campaign	O
of	O
20	O
levels	O
and	O
4	O
secret	O
levels	O
,	O
instead	O
of	O
six	O
episodes	O
with	O
54	O
levels	O
and	O
12	O
secret	O
levels	O
as	O
was	O
in	O
Aliens	B-Application
of	I-Application
Gold	I-Application
.	O
</s>
<s>
The	O
game	O
's	O
working	O
title	O
was	O
"	O
Blake	B-Application
Stone	I-Application
:	O
Firestorm	O
"	O
.	O
</s>
<s>
The	O
developers	O
were	O
limited	O
by	O
memory	O
constraints	O
and	O
programming	O
issues	O
when	O
trying	O
to	O
add	O
additional	O
digitized	O
voices	O
into	O
the	O
game	O
,	O
and	O
ended	O
up	O
playing	O
pre-existing	O
voices	O
from	O
Aliens	B-Application
of	I-Application
Gold	I-Application
backwards	O
.	O
</s>
<s>
Just	O
like	O
Aliens	B-Application
of	I-Application
Gold	I-Application
and	O
Wolfenstein	B-Application
3D	I-Application
,	O
the	O
maps	O
were	O
designed	O
using	O
Tile	O
Editor	O
(	O
TEd	O
)	O
.	O
</s>
<s>
Apogee	O
released	O
the	O
source	O
code	O
,	O
long	O
thought	O
to	O
be	O
lost	O
,	O
under	O
the	O
GNU	B-License
GPL-2.0-or-later	I-License
license	O
in	O
2013	O
to	O
promote	O
the	O
sale	O
of	O
the	O
Apogee	O
Throwback	O
Pack	O
on	O
Steam	B-Application
on	O
July	O
8	O
,	O
2013	O
.	O
</s>
<s>
The	O
Steam	B-Application
release	O
included	O
support	O
for	O
Windows	O
and	O
MacOS	B-Application
.	O
</s>
